On December 23, the reporter learned from the China Petroleum Drilling Engineering Technology Research Institute that the near-bit geosteering drilling system (CGDS) independently developed by the institute successfully captured the oil layer 166 meters in the Fangshui 86-Ping 26 well in the outer oilfield of Daqing Oilfield. Adding tools for the exploitation of thin oil layers in Daqing Oilfield. The near-bit geosteering drilling system was drilled at the Fengshui 86-Ping 26 well at 22 o'clock on November 25, and was successfully drilled at 0:12 on December 10. The drilling depth was 2,365 meters. The instrument entered the well for 337 hours, and the pure drilling was carried out for 91 hours and 30 minutes. The cumulative footage was 799 meters. There was no drilling tool due to equipment reasons or screw drilling tools. According to past experience, the use of foreign LWD equipment in conventional horizontal well construction often results in an average of more than 2 drills due to instrumental reasons. The near-bit geosteering drilling system is recognized as the 21st century drilling cutting technology in the international drilling industry. It integrates drilling technology, logging technology and reservoir engineering technology. It uses near-bit geology, engineering parameter measurement and measurement while drilling to ensure the actual well. Through the eye reservoir, the wellbore orbit is adjusted and controlled in real time according to the characteristics of the formations monitored while drilling, so that the drill bit smells “oily taste†and has the characteristics of identifying the oil and gas layer while drilling and guiding function. Under the leadership of Su Yi Na, an academician of the Chinese Academy of Engineering, PetroChina developed a near-bit geosteering drilling system in 2007, breaking the monopoly of foreign companies on this technology. At present, this system has been applied in 84 oil wells in Jianghan Oilfield, Jilin Oilfield, Liaohe Oilfield and Jiangsu Oilfield. In early 2011, this system was also applied in Canadian companies. In May 2011, China National Petroleum Exploration and Production Branch deployed a near-bit geosteering drilling system using the Drilling Institute in Daqing Oilfield and required the system to be used in the thinnest and most difficult wells in the reservoir. The first well was selected from the well-known 86-Ping 26 well. The Fangshui 86-Ping 26 well is managed by the No. 8 Oil Production Plant of Daqing Oilfield. It is the horizontal well of the infrastructure in this block in 2011. Due to the control of the large river-delta sedimentary topography in the north, the thickness of the single sand layer varies greatly from north to south. The number of sandstone layers is large, the difference between layers is large, the plane continuity is poor, the oil-water distribution is more complicated, and the thickness of the thinnest oil layer is less than 0.5 m. Adding reserves to production has always been a big problem. The construction of the target layer is unknown, there is no comparison of adjacent well data, there is no difficulty in the successful experience of three-dimensional obstacle wells, and there are many uncertainties in the working environment during the winter season. In this construction, the system withstands severe tests with stable performance, reduces the number of drills, reduces the labor intensity of workers, effectively shortens the drilling cycle and saves drilling costs. More importantly, due to the short drilling time, this well greatly reduces the probability of complications.
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